/*
 * Copyright (c) 2011, Åpen sone for eksperimentell informatikk
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *    - Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *    - Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *    - Neither the name of the <organization> nor the
 *      names of its contributors may be used to endorse or promote products
 *      derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package no.uio.ifi.sonen.aicycles;

/**
 *
 * @author Sigmund Hansen <sigmund@chickensoft.com>
 */
public class Cycle {
    /** The horizontal position of the cycle. */
    private int x;
    /** The vertical position of the cycle. */
    private int y;
    /** The direction the cycle is travelling. */
    private volatile Direction dir = Direction.N;
    /** Whether the cycle is alive or not. */
    private boolean alive = true;
    
    /**
     * Creates a cycle at the given position.
     * 
     * @param x The cycle's X coordinate.
     * @param y The cycle's Y coordinate.
     */
    public Cycle(int x, int y) {
        this.x = x;
        this.y = y;
    }
    
    /**
     * Gets the cycle's X coordinate.
     * 
     * @return The cycle's horizontal position.
     */
    public int getX() {
        return x;
    }
    
    /**
     * Gets the cycle's Y coordinate.
     * 
     * @return The cycle's vertical position.
     */
    public int getY() {
        return y;
    }
    
    /**
     * Gets the direction the cycle is headed.
     * 
     * @return The cycle's heading.
     */
    public Direction getDirection() {
        return dir;
    }
    
    /**
     * Sets the direction the cycle is headed.
     * 
     * @param dir The new direction of the cycle.
     */
    public void setDirection(Direction dir) {
        this.dir = dir;
    }
    
    /**
     * Kills the cycle.
     */
    public void kill() {
        alive = false;
    }
    
    /**
     * Checks if the cycle is alive.
     * 
     * @return true if the cycle is alive, false otherwise.
     */
    public boolean isAlive() {
        return alive;
    }
    
    /**
     * Moves the cycle in the direction it is headed.
     */
    public void update() {
        if (!alive) {
            return;
        }
        
        switch (dir) {
            case N:
                y--;
                break;
            case E:
                x++;
                break;
            case S:
                y++;
                break;
            case W:
                x--;
                break;
        }
    }
}
